Extending Internal API using *_slap_interface_workflow

This MR aims to introduce and extend the internal API with the support for manage:

   - Project
   - Organisation
   - Site (also Organisation)
   - Tokens
   - Computer Network
   
So via the introductions of workflows we included the following methods:

  - Project.approveRegistration()
  - Project.leaveProject()
  - Project.acceptInvitation()
  - Organisation.approveRegistration()
  - Organisation.leaveOrganisation()
  - Organisation.acceptInvitation()
  - Person.requestProject(project_title)
  - Person.requestOrganisation(organisation_title)
  - Person.requestSite(organisation_title)
  - Person.requestToken(request_url)
  - Person.requestNetwork(network_title)
  - ComputeNote.requestTransfer(...)
  - InstanceTree.requestTransfer(...) 
  - ComputerNetwork.approveRegistration()
  - ComputerNetwork.requestTransfer(...)
 
  
This API with minor exceptions, don't replaces the way the Hateoas/JIO website interacts with ERP5, so the original scripts are kept and just changed to call internal APIs.


See merge request !348